Inkqubo yokuvelisa i-ultra-high viscosity sodium carboxymethyl cellulose

1. Umgaqo jikelele wemveliso yeCMC

(1) Ukusetyenziswa komlinganiselo (indlela yokunyibilikisa, ibalwa ngetoni nganye yemveliso): iilitha zomqhaphu, 62.5kg; i-ethanol, 317.2kg; ialkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; itoluene, 310.2kg,

(2) Umgaqo wokuvelisa kunye nendlela? Iselulosi yealkali yenziwe ngeselulosi kunye nesodium hydroxide isisombululo esinamanzi okanye isodiyam hydroxide ethanol isisombululo esimanzi, kwaye emva koko sasabela nge-monochloroacetic acid okanye i-sodium monochloroacetate ukufumana imveliso ekrwada, kwaye imveliso yealkaline yomile, Idityaniswe kwi-carboxymethyl cellulose efumanekayo kurhwebo (umdiliya wetyuwa yesodium. ). Imveliso ekrwada ke iye ingathathi ntweni, ihlanjwe, kwaye isodium chloride isuswe, emva koko yomiswe kwaye icunyuzwe ukufumana i-sodium carboxymethyl cellulose esulungekileyo. Ifomula yemichiza imi ngolu hlobo lulandelayo:

(C6H9O4-OH)4+nNaOH-(C6H9O4-ONa)n+nH2O

(3) Inkcazo yenkqubo

I-cellulose iyachithwa kwaye inqunyanyiswe kwi-ethanol, yongeza i-lye kunye ne-30 imvula phantsi kokuvuselela rhoqo, gcina kwi-28-32°C, pholisa phantsi kwiqondo lokushisa eliphantsi, yongeza i-monochloroacetic acid, ukushisa ukuya kwi-55°C kwi-1.5h kwaye uphendule i-4h; yongeza i-acetic acid ukuze i-neutralize umxube wokusabela, Imveliso ekrwada ifunyenwe ngokwahlula isinyibilikisi, kwaye imveliso ekrwada ihlanjwe kabini ngolwelo lwemethanol kwisixhobo sokuhlamba esiqulunqwe ngumxube kunye ne-centrifuge, kwaye yomiswe ukufumana imveliso.

Isisombululo se-CMC sine-viscosity ephezulu, kwaye utshintsho lobushushu aluyi kubangela i-gelation.

2. Inkqubo yokuvelisa i-ultra-high viscosity sodium carboxymethyl cellulose

  Inkqubo yokuvelisa i-ultra-high viscosity sodium carboxymethyl cellulose.

inyathelo:

(1) Beka i-cellulose, i-alkali kunye ne-ethanol kwi-alkalization kneader ngokomlinganiselo wokuqhuba i-alkalization phantsi kokhuseleko lwe-nitrogen, kwaye emva koko ubeke kwi-etherifying agent chloroacetic acid isisombululo se-ethanol ekuqaleni etherify izinto;

(2) Ukuthutha ezi zixhobo zingasentla kwi-etherification kneader ukulawula ubushushu kunye nexesha lokuphendula ukusabela kwe-etherification, kunye nokuthutha izinto kwitanki yokuhlamba emva kokuba i-etherification reaction igqityiwe;

(3) Geza i-etherification reaction material kunye ne-dilute ethanol isisombululo sokususa ityuwa eyenziwa yi-reaction, ukwenzela ukuba ukucoceka kwemveliso kunokufikelela ngaphezu kwe-99.5%;

(4) Emva koko izinto ziphantsi koxinzelelo lwe-centrifugal, kwaye izinto eziqinileyo zithunyelwa kwi-stripper, kwaye i-solvent ye-ethanol ikhutshwe kwizinto eziphathekayo nge-stripper;

5 Inzuzo kukuba inkqubo igqibelele, isalathisi somgangatho wemveliso sinokufikelela kwi-viscosity ye-1% uhlobo lwe-B> 10000mpa.s, kunye nococeko> 99.5%.

  I-Carboxymethyl cellulose iphuma kwisakhiwo se-ether esifunyenwe ngokuguqulwa kweekhemikhali zeselulosi yendalo. Iqela le-carboxyl kwikhonkco lemolekyuli linokwenza ityuwa. Eyona tyuwa ixhaphakileyo yityuwa yesodium, eyile sodium carboxymethyl cellulose (Na -CMC), ngokuqhelekileyo ebizwa ngokuba yiCMC, yi-ionic ether. I-CMC ngumgubo ophezulu we-fluidity, omhlophe okanye otyheli okhanyayo ngenkangeleko, ayinancasa, ayinavumba, ayinabungozi, ayinakutsha, i-non-mildew, kwaye izinzileyo ekukhanyeni nasebushushu.